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(NoModeL) J. H. CAMPBELL.

Process of and Apparatus for Extinguishing Fires; No. 234,531. PatentedNov. 16,1880.

N,PETERS, PEOTQLITHUGRAPHER, WASHINGTON. D C.

NHED STATES PATENT OFFicE.

JOSEPH H. CAMPBELL, OF PITTSBURG, PENNSYLVANIA, ASSIGNOR OF ONE-SIXTEENTH TO HENRY T. \VILEY, OF BOSTON, PA., AND ONE-EIGHTH TO FRANKPATTERSON, OF BUENA VISTA, PA.

PROCESS OF AND APPARATUS FOR EXTINGUISHING FIRES.

SPECIFICATION forming part of Letters Patent No. 234,531, dated November16, 1880. Application filed September 27, 1880. (No model.)

To all whom 'it may concern:

Be it known that I, JOSEPH H. CAMPBELL, of Pittsburg, in the county ofAllegheny and State of Pennsylvania, have invented a new and usefulImprovement in Process of and Apparatus for Extinguishing Fires; and Ido hereby declare that the following is a full and exact descriptionthereof, reference being bad to the accompanying drawings, and tothelet- 1o ters of reference marked thereon.

My invention relates to extinguishing fires by carbonic-acid gas; and itconsists in the method of generating the said gas (without thecommingling-of two reagents, such as sul- 1 5 ph uric acid and thecarbonate of lime or soda,) by drawing air througli a burning mass ofcharcoal, then cooling said commiugled air and carbonic-acid gas, inwhich condition it is ejected upon the fire to be extinguished.

To enable others skilled in the art with which my inventionis mostnearly connected to make and use it, I will proceed to more fullydescribe it and the operation thereof.

In the accompanying drawing, which forms 2 part of my specification, Arepresents a steamboiler or air-blast device, to which is attached apipe, B. which communicates with the lower part of an open furnace, O,charged with burning charcoal D.

The pipe 13 is provided with a device, E,

known as a steam-siphon, for causing acurrent through pipe B and drawingair through and carbonic-acid gas from the furnace O and forcing thecombined air and carbonic-acid 5 gas through said pipe B into thecooling device F, which consists of a casing divided into twocompartments, H and I. The compartment H is furnished with a coil ofpipe, J, which communicates with the pipe B and chamber I, to which isattached a hose furnished with a suitable nozzle for ejecting thecarbonic-acid gas upon the fire to be extinguished. The coil of pipe inchamber H should be covered with cold water, for the purpose of coolingthe carbonic-acid gas and air combined 4 5 during its passage throughsaid pipe to the compartment I of the cooling device.

The apparatus hereinbefore described may be modified in its constructionwithout departing from the principle of operation thereof, and saidapparatus or modified form of it may be mounted upon suitablerunning-gear for the purposes of a fire-engine used for extinguishingfires.

The form and construction of the apparatus hereinbefore described Ileave to the skill and taste of the constructor.

By the process hereinbefore described I am enabled to generatecarbonic-acid gas in unlimited quantities, and in a suitable conditionfor forcing it upon the fire to be extinguished, so that in theextinguishmcnt of said fire the burning material will be cooled in theoperation.

Having thus described my improvement, what I claim as of my inventionis- 1. In extinguishing fires by carbonic-acid gas, the method ofgenerating the gas without the commingling of two reagents, which consists in drawing air through a burning mass of charcoal, and thencooling the said air and commingled carbonic-acid gas, in whichcondition it is ejected upon the fire, substantially as set forth.

2. The apparatus consisting of the steam generator or blast A, pipe B,steam or air forcing device E, furnace O, and cooling device F,constructed, arranged, and operating substantially as herein described,and for the purpose set forth.

JOSEPH H. CAMPBELL.

Witnesses:

A. 0. JOHNSTON, JAMES J. JOHNSTON.

